Yes i do. And now here are the two variants: if i specify only cellZones i get my 201 regions and everything is nice but i dont get the interactions between them (mappedWall ...) but if i do specify cellZones and faceZones i get 201 regions which are named + 1000 other regions but the connections are made between them. for the splitMeshRegions i have tried everything from cellZonesOnly to insidePoint, largest, useFaceZones, sloppyCellZones, ... and nothing is working. At the moment i am trying to solve it with topoSet to if nothing else combine all of these cells into one region called unwanted or something but i dont know how i would delete these cells before running the simulation. 🤔